Grubber blade mounting means



y 1 33- F. F. PARIS 6 GRUBBER BLADE MOUNTING MEANS Filed May 24, .1932

' INVENTOR, /7 7. @a/LLQJ Patented May 9, 1933 UNITED STATES v FRED .F. PARIS, OF BERKELEY; CALIFORNIA GRUBBER BLADE MOUNTING MEANS Application filed May 24,1932. Serial no. 613,189.

This invention is a grubber blade and mounting means and is specially directed to a blade quick-detachably mounted on suitable arms, which arms are mounted on a rotatlng member for grubbing asparagus roots, al-

though this grubber may be used for many additional purposes, such as pulverrzing the soil, loosening soil, or for other grubbing purposes.

The main object of the invention is to provide a quick-detachable blade for grubbers.

Another object of the invention is to provide mounting means and an arm for grubber blades in Which the blade is provided with the most satisfactory cutting angle, and the mounting means and the arm are provided with the most eflicient angles relative to the axis of the rotatingmember on which they are mounted.

A further object of the invention is to provide mounting means for the blade in which the loosening of a single screw permits removal of the blade, and in which the mounting means is so disposed and formed as to make the blade self-retaining during operation.

Other objects and advantages of the invention will become apparent as the following description is read on the drawing forming a part of this specification and in which similar reference characters are used to indicate similar parts throughout the several views, of which:

Fig. 1 is a side elevation of the arm and U5 mounting means for the blade.

Fig. 2 is a rear elevation of Fig. 1.

Fig. 3 is a section taken on line 3--3 of Fig. 2 and showing the blade mounted and locked in position.

Fig. 4 is a section taken on line H of Fig. 3. p

The invention consists of an arm 10 provided with suitable fastening holes 11 and 12 which are provided for the purpose of boltin the arm to spiders or a rotary member, tiese holes being placed adjacent the inner end of the arm in spaced relation.

A blade mounting shoe 13 is suitably secured or formed integral with the outer end of the arm 10 and is angularly related to the arm as indicated at 14, the most efficient and satisfactory angle at this point being substantially 'Z 6, while the frontof the arm is angularly related to the blade as indicated at 15, the most satisfactory angle in this case being substantially 97 so that the blade is actually given an outward inclination in reference to the longitudinal axisof thearm and, in addition,'"given a side sweep by the angular side relation shown in Fig. 2. This method ofmountin'g provides a truly horizontal cut with a shearing'action and terminates in a twist or lift, causing complete 7 breaking up of the'soil and clearing the knives of dirt. 1 f' 7 (it The shoe 13 is provided withtwo pins, 16 and 17 which are provided with suitable heads 18, the space between the head and the shoe being just sufiicient to slidably receive the rearward portion of the'lola'de 19, the blade being set in angular relation to the transverse axis of'the arm 10 as shown in Fig. 3, the rivets being set-at. an angle of substantially 30 relative to this transverse axis or relative to the front 'surfacef'2O of the arm. An aperture is provided in the shoe at 21 for reception of a screw 22; which aperture is sufficiently large to permit free rotation of the screw therein. 5 f i p The blade is rearwardly converging and has a blunt rear edge 23 and two angularly related slots 24 and 25, whichare adapted to receive the rivets 16 and 17., ,The "$101224 is soformed as to permit the 'blade to be swung about the pivot formed by the rivet 17 to permit disengagement from this rivet, and slot 25 is so formed as to permit the blade to be swung about and to be disengaged after swinging through a' small angle. The Qforward or cutting edge of the blade is preferably made approximately twice the length of the rearward edge being so proportioned as to leave littlesurface for accumulation and retention of dirt. The. forward or cutting edge of the-blade is sharpened as indicated at 26 and is preferably provided with a stellite facing or other relatively wearresisting metal, the sharpened edge of the blade being formed substantially parallel to the rivet centers or at an angle'of substa'ntially relative to the transverse axis of the arm 10. The blade may be driven in place on the rivets by driving from the sides, due to the relative arrangement of the slots, no driving being required on the sharp edge for complete mounting of the blade.

The locking member consists of a substantially triangular block 27 which fits between the rearward edge 28 of the blade and the side surface 29 of the arm 10 and has a tapped hole at 30 to receive the screw 22.

It will be noted that this locking member closely fits between the back of the blade and the side of the arm, and is retained in position by the screw 22 and prevents the blade from being swung about the pivot formed .by rivet 17, therefore, cannot become disengaged fromv rivet l6.- By unscrewing the length of time under the type of work per formed.

. The specific relation of the arm and the blade obtain the-most eificient and most satisfactory results that are possible to obtain, and decreased efliciency'is clearly indicated when theangular relation of these two elements is varied by even a'small angle over the angles set forthin the preceding disclosure.

.H1V1I1g described an operative device, it

will; be understood that variations in construction and arrangement of parts which are conslstent with the appended claims may be tatin about the center of the one slot when the sits are in cooperation with headed elements.

3. Means for removably securing a blade to a shoe having an arm comprising two spaced apart rivets in said shoe, a slot formed in said blade pivotally and slidably cooperating with one rivet, the other slot slidably cooperating with the other rivet and a locking element cooperating between the back of the blade andthe side of the arm for preventing rotative movement of said blade about said one rivet.

4. Locking means for a blade on a mounting element comprising two spaced apart rivets adapted to slidably receive'a blade under the heads thereof, two slots formed in said blade, one of said slots being formed from the side of the blade and the other of the slots being formed from the back, the

engaging the rear edge of the blade adjacent to the one slot. g

5. A mountingshoe and arm for a grubber blade comprising an arm, and a shoe integral therewith, said shoe having twospaced apart headed pins projecting from the inner face,

for receiving a grubber blade, and a bolt receiving aperture formed in said shoe rearwardly'ofone of the pins at one side of the arm, whereby a retaining block may be secured rearwardly of the blade when mounted.

In testimony whereof I afiix my signature.

FRED F. PARIS.

resorted to without detracting from the spirit 7 or scope of the invention or sacrificing any of the advantages thereof.

I-claim:

1. A grubber element comprising an arm having an integral shoe angularly related thereto, said shoe being provided with two spaced apart rivets having heads, and a grubber .blade provided with angularly related slots, one of said slots being adapted to tangentlally engage one of the rivets with the otherrivet used as .a pivot in cooperation with the other slot,-,and a locking element adapted to prevent rotative movement of the blade about the other pivot.

2. A grubber blade provided with one slot angularly related to the rear edge and extending from the side of the blade and a sec- 0nd slot formed from the back of the blade tangentially relative to the center of the one Slot, and a releasable element cooperating With the rear edge of the blade adjacent the One slot for preventing said blade from ro- 

